SAR class GB
| SAR class GB | |
|---|---|
 Garratt GB 2166 in Voorbaai
|
|
| Numbering: | 2160-2166 |
| Number: | 7th |
| Manufacturer: | Beyer-Peacock |
| Year of construction (s): | 1921, 1924 |
| Retirement: | 1966 |
| Type : | (1'C1 ') (1'C1') h4 (Garratt) |
| Gauge : | 1067 mm ( cape track ) |
| Service mass: | 76 (71.8) t |
| Friction mass: | 47.5 (45.6) tons |
| Wheel set mass : | 7.9 (7.6) t |
| Driving wheel diameter: | 1085 mm |
| Impeller diameter: | k. A. |
| Cylinder diameter: | 305 mm |
| Piston stroke: | 508 mm |
| Boiler overpressure: | 124.1 N / cm² |
| Grate area: | 2.16 m² |
| Radiant heating surface: | 9.73 m² |
| Tubular heating surface: | 87.7 m² |
| Superheater area : | 16.1 m² |
| Train brake: | Suction air brake |
The vehicles of the class GB of the South African Railways (SAR) were steam locomotives of the type Garratt .
Together with three locomotives of the NGG 11 class and one of the GA class , the prototype of the class had already been ordered in 1914; However, it did not go into service until 1921 because of the First World War.
Compared to the GA, which was built for mainline use, the GB was only about half as heavy and with an axle load of only 7.6 t was intended for secondary lines with particularly weak superstructures. Unlike the GA, the GB had inner running axles and thus the axle sequence (1'C1 ') (1'C1'). Except for the size and axle arrangement, both classes had the same design features.
The first locomotive with the number 1650 was tested from Durban on the south coast line in Natal , on which the tracks were very poorly laid. It proved its worth, and in 1924 six more machines with the numbers 2160 to 2165 were put into service and used on branch lines in the Cape Province . The prototype was given the new number 2166.
The six locomotives procured in 1924 had an increased water supply and were therefore somewhat heavier than the prototype (the data of which are in brackets in the table opposite). They also received side windows in the driver's cab.
The locomotives remained in service until 1966, most recently on the Aliwal North – Barkly East route . One of the machines (No. 2166) has been preserved and is now in the Outeniqua Railway Museum in George .
literature
- AE Durrant: Garratt locomotives of the world. Birkhäuser, Basel et al. 1984, ISBN 3-7643-1481-8 .
